I'm trying to import a .vsdx file into Draw.io for Confluence, and having issues. Using either the import dialog or the drag-and-drop method both fail silently in the UI.
[Error] Failed to load resource: the server responded with a status of 404 (Not Found) (drawio-openServlet, line 0) http://..../plugins/servlet/drawio-openServlet
I then tried using the draw.io website directly, using drag-and-drop, and the document imported perfectly. So I don't think it's the Visio file itself, but rather some missing file/functionality in the confluence plugin?